Dependents cannot receive earned income credit. If you were claimed as a dependent then you are not eligible for EIC. As for whether your parents could get EIC for claiming you---that depends on THEIR earned income.
If you were not claimed as a dependent for 2021, then it is possible that you are eligible for EIC on a 2021 return since the criteria is different in some ways for 2021. The age limitations are different. But dependents still cannot get EIC for 2021.
https://ttlc.intuit.com/questions/1899157-what-are-the-qualifications-for-the-earned-income-credit-e...
https://www.irs.gov/credits-deductions/individuals/earned-income-tax-credit/use-the-eitc-assistant
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